This is a legit number from Aetna's call center in Blue Bell, PA. There are a number of departments located in this office: EAP services, case management, etc.
I got a phone call from this number at 6:30 AM!! Since I recognize the area code and know people in the 215 area code, I answered. Seriously people! If you are going to call me for some stupid reason, wait until normal business hours in California!!